Re: Question about RAC

Hi Michael

They are two Fujitsu Primepower. Not sure about the model though. I will let
you know when I get the details

Thanks

Alex



On 10/30/06, Michael Erwin <michael.erwin@xxxxxxxxxx> wrote: 

Hi Alex,



Logical or Physical partitioning (L-Pars) a single host environment to
support multiple RAC instances is logical as long as the host server can
provide an extreme fault tolerance they need for HA, specifically think Sun
25k, HP SuperDome, IBM p590 class systems. This strategy allows customers to
grow & migrate slightly easier than building a 2 node, then adding 2 nodes
in the future. In these environments, each partition acts & is managed as
you would multiple hosts.



Many times this is the case with customers that outsourced IT environment
management, i.e. Perot, EDS, IBM, where the customer pays for physical
system, not L-Pars. In the past I have seen customers buy the biggest boxes
on the planet, and then l-par them into 2 & 4 CPU host boxes since it saved
them on the outsourced support, in effect spending $5million, so they
wouldn't have to spend an additional $300k per month to support 6 smaller
hosts. Then they could change the partition configuration as needed or
warranted.



Having said all of that, what is still illogical is for customers to put
multiple related instances on the same physical partition of hosts, i.e.
Reporting/OLAP Instance along with the OLTP Instance on the same physical
CPU/Memory/Bus partition or host.



Hopefully, your customer isn't considering the use of VMware or Parallel
to partition a single small i86 host for production environments.




Michael Erwin
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Hotsos Symposium 2007 / March 4-8
Visit www.hotsos.com for curriculum and schedule details...

________________________________

From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of amonte
Sent: Mon 10/30/2006 1:24 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Question about RAC


Hi all

I have a question about RAC.

I have implemented a few RAC on a couple of customers. I have always
worked with two nodes and a single database, i.e 2 servers and a common
database in a shared storage.

I have a customer who wants to use 2 servers to implement 4 RACs, i.ehacing 4 
instances in each server. Has anyone done this sort of
implemntation? I am not sure if this is logical or ilogical :-)


Thanks

Alex



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